mod: bump github.com/google/flatbuffers from 24.3.25+incompatible to 24.12.23+incompatible #14955

Job	Run time
arch (presubmit_arch_linux)	10m 49s
build	13m 13s
arch (presubmit_arch_freebsd)	6m 31s
aux	4m 27s
dashboard	3m 17s
arch (presubmit_arch_netbsd)	4m 24s
arch (presubmit_arch_openbsd)	4m 24s
race	8m 31s
arch (presubmit_arch_darwin)	4m 30s
arch (presubmit_arch_windows)	3m 28s
arch (presubmit_arch_executor)	3m 18s
gvisor	4m 16s
old	6m 33s
race_dashboard	4m 59s
	1h 22m 40s

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